| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* High precision, low overhead timing functions. IA-64 version. |
| 2 | Copyright (C) 2001-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 2001. |
| 5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2.1 of the License, or (at your option) any later version. |
| 10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #ifndef _HP_TIMING_H |
| 21 | #define _HP_TIMING_H 1 |
| 22 | |
| 23 | /* We always assume having the timestamp register. */ |
| 24 | #define HP_TIMING_AVAIL (1) |
| 25 | #define HP_SMALL_TIMING_AVAIL (1) |
| 26 | |
| 27 | /* We indeed have inlined functions. */ |
| 28 | #define HP_TIMING_INLINE (1) |
| 29 | |
| 30 | /* We use 64bit values for the times. */ |
| 31 | typedef unsigned long int hp_timing_t; |
| 32 | |
| 33 | /* The Itanium/Merced has a bug where the ar.itc register value read |
| 34 | is not correct in some situations. The solution is to read again. |
| 35 | For now we always do this until we know how to recognize a fixed |
| 36 | processor implementation. */ |
| 37 | #define REPEAT_READ(val) __builtin_expect ((long int) val == -1, 0) |
| 38 | |
| 39 | /* That's quite simple. Use the `ar.itc' instruction. */ |
| 40 | #define HP_TIMING_NOW(Var) \ |
| 41 | ({ unsigned long int __itc; \ |
| 42 | do \ |
| 43 | asm volatile ("mov %0=ar.itc" : "=r" (__itc) : : "memory"); \ |
| 44 | while (REPEAT_READ (__itc)); \ |
| 45 | Var = __itc; }) |
| 46 | |
| 47 | #include <hp-timing-common.h> |
| 48 | |
| 49 | #endif /* hp-timing.h */ |